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Rallytwit
77mm ITM Piston, Confirming Dish Volume.
#1
No life (a.k.a. DattoMaster)
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I just got a set of A15 pistons, ITM # RY6119 and can confirm that the dish volume is 10cc. Note this is the offset dish style.

Since this question comes up from time to time I'm posting this so people can find it in a search.

Also note the compression ratio with a GX head (29cc chamber) & GX .8mm thick gasket will be 9.89-1.

Posted on: 2019/12/15 0:35
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ddgonzal
Re: 77mm ITM Piston, Confirming Dish Volume.
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Is that the 6.5 mm depth of offset dish? or the 3.5m deep

Posted on: 2019/12/15 21:19
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Rallytwit
Re: 77mm ITM Piston, Confirming Dish Volume.
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No life (a.k.a. DattoMaster)
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Dave they are 6.5mm deep.

I'm going to give up some power over buying another set of flat tops from JE (probably 5-6) but as these were on $99 I'm willing to live with it. I have to check but I also may be able to go back to running 91 octane pump gas. I'm expecting the motor to be around 95hp at the wheels.

Posted on: 2019/12/15 22:46
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ddgonzal
Re: 77mm ITM Piston, Confirming Dish Volume.
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Not bad only $104/set of 4 from rockauto.com includes rings which is good because they are different size than other A15 rings

6.5mm is a deeper dish than the offset G34 A15 pistons -- they are for 1981-1982 Datsun 210 engine nominally 8.5:1 with 35cc combustion chambers

Attach file:


jpg  RY6119-STD.jpg (66.43 KB)
174_5df6bdcf8c416.jpg 985X937 px

Posted on: 2019/12/15 23:12
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dattoman_1000
Re: 77mm ITM Piston, Confirming Dish Volume.
#5
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Rock won't ship to Oz anymore
Stupid tax system

Posted on: 2019/12/16 11:20
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Rallytwit
Re: 77mm ITM Piston, Confirming Dish Volume.
#6
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SW Motorsport had them at a decent price I was planning on ordering them but they became available from Rockauto.

Posted on: 2019/12/17 3:02
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